souryou ga takai.

It is read:

• 送料 = そうりょう (sōryō)
• が = ga
• 高い = たかい (takai)

So the whole sentence is:

そうりょう が たかい。

送料 is a noun. It means shipping fee, postage, or delivery charge, depending on context.

It is made of:

• 送 = sending
• 料 = fee/charge

So it refers to the money charged for shipping something.

が marks 送料 as the thing being described.

In this sentence, 高い describes 送料, so が shows that shipping costs are what is high.

A simple way to think of it:

• 送料 = shipping fee
• が = is the thing that...
• 高い = is high/expensive

So が connects the noun to the adjective predicate.

Yes, 送料は高い is also correct.

The difference is mainly nuance:

• 送料が高い: focuses on the fact that the shipping is high
• 送料は高い: sets shipping as the topic, often with a contrastive feeling, like As for the shipping, it’s high

For example:

• 商品は安いけど、送料は高い。
  The product is cheap, but the shipping is expensive.

So both are natural, but は often sounds more contrastive or topical.

Because this is in the plain form.

高い is an い-adjective, and in plain casual Japanese it can end a sentence by itself:

• 送料が高い。

If you want to be more polite, you can say:

• 送料が高いです。

Both are correct. The version without です is just less polite / more casual / more plain.

高い is an い-adjective.

It means high or expensive, depending on context. With 送料, it is naturally understood as:

• the shipping cost is high
• or more natural English: the shipping is expensive

Because it is an い-adjective, it does not need だ or です to function as the main predicate in plain form.

In Japanese, an adjective can be the main predicate of a sentence.

So:

• 送料が高い。

is a complete sentence even though there is no separate verb like is.

English needs is:

• The shipping cost is high.

Japanese does not need a separate equivalent here:

• 送料が高い。

That is perfectly normal Japanese grammar.

Literally, 高い means high. But with prices, fees, and costs, it usually means expensive.

So with 送料, both ideas are related:

• literal sense: the shipping fee is high
• natural English meaning: the shipping is expensive

So in context, expensive is usually the best translation.

Yes, you can think of the sentence as having only the necessary information stated.

Japanese often leaves out anything that is already clear from context. Here, 送料 is explicitly stated, so nothing else is needed.

English often wants a full structure like:

• The shipping cost is high

Japanese is happy with:

• 送料が高い。

No extra subject like it is needed.

Yes. Like many Japanese nouns, 送料 does not show singular/plural in the way English does.

Depending on context, it can mean:

• the shipping fee
• shipping fees
• shipping cost
• shipping costs

The surrounding context tells you which is most natural in English.

Yes, it is very natural.

It sounds like a simple comment or complaint, for example when someone sees an online order total and reacts:

• 送料が高い。
  The shipping is expensive.

Japanese often uses short, direct sentences like this in conversation, reviews, messages, and online comments.

The most direct polite version is:

• 送料が高いです。

Other possible polite variations include:

• 送料が高いですね。 = The shipping is expensive, isn’t it?
• 送料は高いですね。 = The shipping is expensive, though / as for shipping, it’s expensive

So if you are speaking politely, just adding です is the easiest change.

Because 高い is an い-adjective, it changes like this:

• 送料が高い。 = The shipping is expensive.
• 送料が高くない。 = The shipping is not expensive.
• 送料が高かった。 = The shipping was expensive.
• 送料が高くなかった。 = The shipping was not expensive.

Polite versions:

• 送料が高いです。
• 送料が高くないです。 or 送料は高くありません。
• 送料が高かったです。
• 送料は高くありませんでした。

This is a good sentence for practicing い-adjective endings.